[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
4.5k views

You have received an encrypted message from Julius Caesar-- the message is ebiil.  You are asked to decipher the message in order to understand what Caesar trying to say to you.

Hint

Luckily, Caesar has given you a hint, he says: 'I, myself, encoded the message by shifting every word backwards by 3.' 

Solution

Write a program that receives 5 characters 'ebiil'. Then decode those characters into 5 new characters.

Example

#include <stdio.h>

int main(int argc, char *argv[]) {


	char a;
    	char b;
	 	
	scanf("%c%c", &a, &b);
	
	//decode the message how??
	
	printf("%c%c", a,b);
	
	return 0;
}

Input

ebiil

 

 

 

 

 

 

 

 

 

 

Output

hello

** REMEMBER ** 
This is an online-compiler, don't put anything except the codes. If you want to make a comment, please use // or /* */

[Exercise] Coding (C) - asked in Chapter 2: Syntax structure of the C language by (5.9k points)
ID: 26955 - Available when: Unlimited - Due to: Unlimited
edited by | 4.5k views

22 Answers

0 like 0 dislike 
Hidden content!
 *   *  **  ***  *******

int *  * argc, char **  {
** *  *    *****   ***** *     *** */

 ****   * **  * int number;
 * *    **     char a;
* *** *** **  *   * *    * *  b;
*  *** *** *****    **     * c;
** *    ***   * *** ** d;
* ** *     ** *  * *** *  *** e;
** ** ** **     *  ** ** 
*****  *** * *** **** **  forgert how to shift word   **    *  ** *    **  
**  **    ** **  * * ***   ** * ** *   * **    *    ***** * * *** ***   ******  * *  *
**   * *  **     
 *  *  * **** *  * **  the message how??
*  * *  **  **  
 *** * *    * * *  ***  **   *  * * ** ***   *       
** ****   **  
 *      ** * return 0;
}
100/100 answered by (449 points)
edited by
0 0
Case 0: Wrong output
Case 1: Wrong output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Wrong output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
* **  *  **   * * *
 
*  ** *   *      ** * {

 * *   *** 
** =     *  *
    **  **
  =  * * ** 
  =   *** *
 = *   * 

 * = ***
   =   *
 * = *  *
   =  **

**  *  
  ***  *
** ****  * 
 **  *
  * *** 

 * * *** *   * ** *  *
100/100 answered by (153 points)
0 0
Case 0: Correct output
Case 1: Wrong output
commented by (4.3k points)
1 like 0 dislike 
Hidden content!
#include * *   * * * **
#include ** ** * **   **   *

/* run this program using the console pauser or add your own getch, * **   **    **   ** or input loop */

int main(int argc, char *argv[]) {
**  ** *       ** **   * a;
 **  * **** * *** ***  ** * ***** b;
*  *   *  *    ***   * ** c;
**  *   ***  *   *  * **  ** ***   d;
 **        *    ** *  *      e;
 ** ****  *   * **** *
* *   *  *  *** ** *      ** ***      **  the words you want to * ** **  
   *     *** *** * *** 
* ***   **  *****   *** **   = getchar();
***  ********  *** * ** = a+3;
***** ** *      *** * *   *  *
 * *    **  ** ** ***** * * = getchar();
*  ** * ***** *   ****    * *    = b+3;
* **  **         **  * ** * * ***  * ** 
**** ****     *  *  **** *** *   = getchar();
 *****  ***  ***** ** * = c+3;
   *** ** **  ***** * *** *  **    
*******     * **  ****  * *  * = getchar();
 * * * ** * ** * *  *** *  = d+3;
* *** ***** *  * ***    **    ** *
**    **     **  **    * ** = getchar();
   ****   *** ** *  **** ** ***  = e+3;
  *** *         *  *  * ** *  *    *
   * * *       ***   *** **  *    * *   ****     * ***     **  
**  *** ** ** *   * * *    *** ****  * *  *  * **    &a, &b, &c, &d, ** **  *
*  **        ***** *** *****
* ****   * * **** *** ***** ***   the message how??
**   *    ***    ****  * **    
  * * ** *** ** *     **   **   * *  ** * *******      *   a, b, c, d, e);
*  * * *    *  *   *
 ** *  ****   * ***  ****** ***** 0;
}
100/100 answered by (281 points)
edited by
0 0
Your program receives only 2 characters, and it doesn't move characters' positions.

Try to make it receive 5 characters, and move their positions forward by 3.
commented by (5.9k points)
0 0
This exercise expects only 'hello'. However, your code has.....

printf("Put the words you want to decode:");

Kindly consider delete this part :)
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
   * * * * ****  ** 
****  *  * ** * * *

int    ***  *** char ** ** {
/*
** *  *    */

 *    ***

** *  **   ********  *   ****     *** *    **    *  *   ** **  **
a = a+3;
b =  
c = *  
d = d+3;
e = * 

* *    the * **** ****
* **  *   **         *** 
* ** ** ** * *     * ***    

 ** *  *    *   ** ****
** ***  *    *  ***   *  ** * 0;
}
100/100 answered by (273 points)
edited by
0 0
prog.c:28:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:32:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:32:1: error: unknown type name 'OUTPUT'
commented by (4.3k points)
0 0
Your program can end at
  
    return 0;
}
------------------------------------------
You don't need to put

INPUT

ebiil

OUTPUT

hello
commented by (5.9k points)
0 0
Case 0: Correct output
Case 1: Wrong output
commented by (4.3k points)
1 like 0 dislike 
Hidden content!
  ***  * ***  * *** ***
 * ***    ** *  **** * *****

/* run this       the ***  ***  or add your own *** *  *  ***  ***  *** *      or  ** *  * */

int ** * * * char *  * {
**    *    * **  int num,  * 
*  **  * ****    **  
 *  *  **  * 
******  ******* **  *  * * ***** ***
 *   *   *** **** for  ** = *  * * * ** *  * 
{
**     ** * **  *   * =   ***  ***
 ***** ** ** *  if   **** * ** *** 
**  *  *    *  *   =   **  *  * *
 ***** *        ** *  * ** ** 
}
* **  *  * *   ** **** *  * *       * * *        
***    **   *** *  *  0;
50/100 answered by (252 points)
0 0
prog.c: In function 'main':
prog.c:19:2: error: expected declaration or statement at end of input
  return 0;
  ^~~~~~
commented by (4.3k points)
0 0
Great job using an array and a loop. There are two mistakes found in your code. Please check
1.     printf("\n\n%s", code);  <--- in order to make it match the fixed output '\n\n' should be deleted
2.     At the end of your code, there's something missing.
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
   ** ****** * ****
 
 *  * **  ***     ** *  
*
     ***  * *   *  *     *      *   *   * *   * **  *  * * **  **  *  * **   * **

  *         * *  *** *   *
 
* **   *        

**      *  **  ** ***

  ** *   **** * *       ** * * * ***   *   ** ***   *  * **   * ***  *
 
*  =  * * 
 
 *  * b +  *

* = c +  *

* = d + *

 *      *
 
* * *** *  ** **  * *     *    *  * *    
*
 *  *

*
100/100 answered by (268 points)
0 0
It's correct lol you can't judge me
commented by (268 points)
0 0
Well, that's because your output doesn't match with the fixed answer. Please take a look at this
printf("%c%c%c%c%c\n", a1, b1, c1, d1, e1);

Hint: You should delete something  :)

By the way, great job.
commented by (5.9k points)
0 0
printf("%c%c%c%c%c", a1, b1, c1, d1, e1);

How's that?
commented by (268 points)
0 0
That's correct.
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
*   *  *    ** **   *  
 ** *  * **** *** *   

int   *    argc, char    *  {
 ******    *  char * *** 
***** *      * char **** *
*    * * **    char ***
   *       * *  char * *
 ******* ** ****** char *  * *
   *   *   *** 
        ****  *  ** ****  ** * ** input the letter to ***  *    * * 
*  *    * ** 
*     *   **  *   *  * ***   * ***  **  *     ** *  **      * * *     * **     * *** *  * ** ****   
*    **  * * * * **    = **** + 3;
 * * * **  *****  ***** =  *  *  + 3;
***  **    ***  **  = * * * + 3;
* * *   ***   letterc =     + 3;
  * * * * *       * = *** + 3;
  * *  ***   ** *** 
  *  *   * ** *  ** * *** ** * *** * * *  ***    *  *  *     *** **  **  * *  
** * *  *** * ** 
 ** ** *   ** *** ** return 0;
}
100/100 answered
reshown by
0 0
-----------Re-judge-----------
Case 0: Wrong output
commented by (4.3k points)
0 0
Nice, it is correct. You might be wondering why your automatically-generated score is 0.
That's because it expects its output to be only 'hello'. However, what your program showed was:
     Please input the letter to encode: ebiil
     hello

Anyway, great job. Full marks.
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
    * * * **  * **  
  *** * * *  *** ***   

int ** * ** argc, char *argv[]) {
 * *** * * * ** char   ** *
**** *  * * *    char letteri;
 *  * * ** **   char ****** 
*   *    ***  char *   *
 ** *      * * char     * 
* *  ***   * 
* ** *   ****      *  **  *** * **  input the letter to encode: *  * * *    * ***
  *    *** *** 
* **  *    **    * *    *     **  **  ** * ***  *** * **     * ** *** **  ** * *     *   **** ******  *  ***  *   * 
 *           *  *****  *   * +3;
 ** * ***    * *    *  * *** +3;
* *  *   * *         ** +3;
***    *   *  *** *  * *  +3;
 * **** **** **  ** *** *  +3;
*     ** *** *  
 * *  * *** 
       *  * **    ** **** ** *    *  ** * * *  *  ** *  *** * ***** *
 *** *   * *  
* * ****   **    return 0;
}


INPUT
*** *** *  ** 
* ** * *  **  
OUTPUT
**      ** ***   *
100/100 answered by (269 points)
0 0
Nice, it is correct. You might be wondering why your automatically-generated score is 0.
That's because it expects its output to be only 'hello'. However, what your program showed was:
     Please input the letter to encode: ebiil
     hello

Also, it's an online compiler, if you want to make a comment don't forget to use //. For example, //input ebiil
//output hello

Anyway, great job. Full marks.
commented by (5.9k points)
0 0
prog.c:27:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:30:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:30:1: error: unknown type name 'OUTPUT'
commented by (4.3k points)
1 like 0 dislike 
Hidden content!
  ****   * *  *   ******
*** * * *    *  * ***** 

int *    argc, char ** *   {
   **    * ** char  *  *
***    ** **  ** char  * ** 
****** *    *** char    
  * * **  ** char  *  
 ***** *  *    * * char *  ****
***     **  ** 
    *         *  *****     input the    to ****  *** *    *   
***  * *  *   
    **    **  **   *****  *  *****     * *    *       **** ** *** **  ******* *** **  *** ** *  *  * *****  
** * *   ** *   * 
**    *     **  letter = letter + 3;
 ** *  * ***   * ** = **   + 3;
* *     ** **    ** ** = * * * + 3;
* **   * * *    =  *  * + 3;
* *** *** ** *  * *  =  * *   + 3;
 **  **     * 
*   *   * * *  ***** * *    * ** ** letter is ***  *   **  **  * * ****     **    * *    * 
* *    * * **  *  
***** *** ** return 0;
}

INPUT
 ****  ** **  ****  
 * *  ***
 *** 
   * **   **
100/100 answered by (290 points)
reshown by
0 0
Nice, it is correct. You might be wondering why your automatically-generated score is 0.
That's because it expects its output to be only 'hello'. However, what your program showed was:
     Please input the letter to encode: ebiil
     The encrypted letter is hello

Also, it's an online compiler, if you want to make a comment don't forget to use //. For example, //input ebiil
//output hello

Anyway, great job. Full marks.
commented by (5.9k points)
0 0
prog.c:26:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:29:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:29:1: error: unknown type name 'OUTPUT'
commented by (4.3k points)
1 like 0 dislike 
Hidden content!
#include ** * ***  **   * 

int main(int argc, char *argv[]) {
*  *********** *  *      ** * *  ** lettera;
* *    *  *** *  ** * ** *  letterb;
*  *  ****  ********  *** * letterc;
* *  *  *   ** ** *  * ** * letterd;
   **   ** **    * * *    * *  lettere;
*****  ****  **  * *   *** 
 ***** * ** *   ** * * **  *   * **  *  %c %c %c   * **  * ****  *  **   *   ***  * *  ** *  * *     *  *    *      * 
 *  * *  *      *   * ** ** = lettera + 3;
* ** *  *    *    *  *** ***  *****  = letterb + 3;
* * **    ** ** * *  ***** ** *  = letterc + 3;
  *  * * * ***   * **  * ***    * = letterd + 3;
 ***      ** ** ******    * * ** *  = lettere + 3;
 ***   **   * **  *   *  * * *** *** ***    **** *  ** **    
  * * *****         * **** ***  ** * * **** %c %c %c * * *    * *     letterb, ** ****   * * * ****   
**   * ***  **  *       *** 
******  * * *  ****** * * ***  **** 0;
}

*  
* **** 
  **   *    ** * *
* * **
//hello
100/100 answered by (271 points)
edited by
0 0
Nice, it is correct. You might be wondering why your automatically-generated score is 0.
That's because it expects its output to be only 'hello'. However, what your program showed was:
     Please input the letter to encode: e b i i l
     h e l l o

Also, it's an online compiler, if you want to make a comment don't forget to use //. For example, //input ebiil
//output hello

Anyway, great job. Full marks.
commented by (5.9k points)
0 0
prog.c:25:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:28:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:28:1: error: unknown type name 'OUTPUT'
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:10:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%c %c %c %c %c", &lettera, &letterb, &letterc, &letterd, &lettere);
     ^~~~~
prog.c:10:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:10:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:17:5: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
     printf("%c %c %c %c %c", lettera, letterb, letterc, letterd, lettere);
     ^~~~~~
prog.c:17:5: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:17:5: note: include '<stdio.h>' or provide a declaration of 'printf'
commented by (4.3k points)
Page:
Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:172.70.131.187
©2016-2025

Related questions

0 like 0 dislike
2 answers
Shifting backward
[Normal] Essay (Open question) - asked Dec 12, 2017 in Chapter 2: Syntax structure of the C language by 許哲瑋 (449 points)
ID: 37081 - Available when: Unlimited - Due to: Unlimited | 707 views
12,783 questions
183,442 answers
172,219 comments
4,824 users